1. The transmission
The transmission (transmission gearbox) is changing means machine tools, automobiles, tractors or traction machine running speed, a number of different diameter gears. Usually installed between the engine drive shaft and the driven shaft. The transmission is fixed or can change the sub-file and the output shaft of the gear transmission ratio of the transmission input shaft. Also known as the gearbox. A transmission gear mechanism and transmission mechanism composed of transmission mechanism can be made separately or together with the gear mechanism installed in the same housing. Most ordinary transmission gear, and some planetary gear. Usually ordinary gear shift mechanism with a gear and a clutch slip and the like. Sliding gear sliding gear with multiple slip points and the displacement of the gear. With triple sliding gear transmission, a large axial dimension; displacement with sliding gear transmission, compact, but smaller than the gear change. Clutches and meshing type friction points. When engaged with the clutch gear shift should be carried out or stop rotational speed difference is small, the shift may be performed at any rotational speed difference between the friction clutch operation, but small carrying capacity, and can not guarantee that two axes strict synchronization. To overcome this drawback, to coat the engagement clutch friction plate, friction plate against the shift to the driven wheel then joined to the synchronous speed. The planetary gear brake control shifting of the transmission is available. The transmission widely used in machine tools, vehicles and other machinery required shift. Spindle often mounted in the transmission, but it is also called the headstock, compact structure, easy to operate concentrated. On the machine for changing the feed amount referred to the transmission feed box.
automotive transmission has several functions:
① change the transmission ratio, the expansion of the driving wheel torque and speed range, in order to adapt to frequent changes in driving conditions, while the engine is in an advantageous (low fuel consumption and high power) conditions of work;
② at the same rotational direction of the engine case, the car can travel backwards;
③ use neutral, interrupting the power transmission to the engine start, Idle, shift and to facilitate the transmission or power output.
The transmission gear mechanism and by actuating means composed, if necessary, power output device may also be installed. There are two ways in Category: Press ratio varying ways and in different ways according to points manipulation.
automotive transmission by varying the transmission ratio change refused engine crankshaft rotation, in the initial adapted, accelerating, and overcome the need for traveling wheel drive traction vehicle and the different requirements of various road driving conditions, such as different obstacles. Into a manual transmission (the MT), the automatic transmission (AT) on the common, manual / automatic transmission, non-stage transmission.
by a ratio varying ways point:
step-variable transmission is currently the most widely used one. It gear wheel having a plurality of gear ratio value. The train wheel according to a different pattern, there is a fixed transmission axis (normal transmission), and the axis of the rotary transmission (planetary gear) two. At present, cars and light and medium truck transmission gear ratio is usually three to five forward gears and one reverse gear, heavy goods vehicles in combination with the transmission, then there are more stalls. It refers to the number of transmission gear which is called the number of forward gears.
non-stage transmission gear ratio which can be infinitely varied over a multi-stage numerical range, a common power and (hydrodynamic type) two kinds of hydraulic type. Member variable transmission CVT power to a DC series motor, in addition to the application on the trolley, the drive train in the super-heavy dump truck trend is also widely used. Hydrodynamic type continuously variable transmission member is a torque converter.
Integrated type transmission means by the mechanical transmission hydraulic torque converter and a gear-type stepped transmission component, the transmission ratio can be between the maximum and minimum range of several intermittent for stepless change, currently used more often.
points manipulation manner:
type transmission actuating force
is the shift lever manipulated by a driver directly.
-operated automatic transmission
which is the drive ratio selection and automatic shift, the so-called ldquo; rdquo ;, refers to automatic mechanical transmission gear of each transformation is reflected by the engine negativeCharge and a vehicle speed signal system to control the actuator of the shifting system is achieved. The driver simply manipulating the accelerator pedal to control the speed.
-operated semiautomatic transmission
There are two types: one is used several-stage automatic manipulation by the driver operates the shift rest; the other is a preselected type, i.e., driver with buttons previously selected gear, when the clutch pedal or the accelerator pedal is released, turned one electromagnetic device or hydraulic means to shift.
using the classification method:
a manual transmission (the MT)
manual transmission, also called manual transmission, i.e., to change the hand toggle lever gear position in the transmission, change the transmission ratio to achieve the purpose of the transmission. When the clutch depressed, only have to move the shift lever dial. If the driver technology is good, manual transmission mounted in the vehicle to accelerate faster than the automatic transmission vehicle when overtaking also fuel.
of the automatic transmission (the AT)
of the automatic transmission, a planetary gear transmission mechanism, it can automatically perform speed change according to the degree of the accelerator pedal and the vehicle speed changes. The driver simply manipulating the accelerator pedal to control the speed.
In general, conventional automotive automatic transmission the following types: hydraulic automatic transmission, the automatic transmission hydraulic transmission, electric drive automatic transmission, a stepped automatic transmission and mechanical stepless automatic mechanical transmission Wait. The most common is the hydraulic automatic transmission. Hydraulic automatic transmission is mainly composed of a gear shift hydraulic control system mainly comprises two parts automatic clutch and an automatic transmission. It can be automatically performed in accordance with the shift change of the throttle opening degree and the vehicle speed.
The continuously variable transmission (the CVT)
The continuously variable transmission is a gear wheel and two sets of a belt thereof.
Thus, it is simpler than the conventional automatic transmission structure, smaller. Further, it can freely change the transmission ratio, the continuously variable transmission so as to achieve full, the vehicle speed of the automobile changes smoothly, that there is no conventional transmission when shifting ldquo; Dayton rdquo; feeling.
The continuously variable transmission belongs to an automatic transmission, but an automatic transmission which overcomes ordinary ldquo; sudden shift rdquo ;, slow throttle response, fuel consumption disadvantages.
The transmission is Renault (Ranault) of the invention.